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b = 32- a
2a + 3b = 84
2a + 3(32-a) = 84
2a + 64 - 3a = 84
-a = 84-64
-a = 20
a = -20
b = 32-a
b = 32-(-20)
b = 32+20
b = 52
maka nilai bilangan yang kecil adalah -20